java源代码实例

java访问xml文件

Java code

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import java.io.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class xmljava
{ 

public static void main(String args[])
    {    
          Element element=null;
          File f =new File("a.xml");
          DocumentBuilder db=null;        //documentBuilder为抽象不能直接实例化(将XML文件转换为DOM文件)
          DocumentBuilderFactory dbf=null; 
      try{
         
          dbf= DocumentBuilderFactory.newInstance(); //返回documentBuilderFactory对象   
          db =dbf.newDocumentBuilder();//返回db对象用documentBuilderFatory对象获得返回documentBuildr对象

          Document dt= db.parse(f); //得到一个DOM并返回给document对象
          element = dt.getDocumentElement();//得到一个elment根元素
          
          System.out.println("根元素："+element.getNodeName()); //获得根节点

        NodeList childNodes =element.getChildNodes() ;    // 获得根元素下的子节点
    
      for (int i = 0; i < childNodes.getLength(); i++)     // 遍历这些子节点

   {       
       Node node1 = childNodes.item(i); // childNodes.item(i); 获得每个对应位置i的结点

     if ("Account".equals(node1.getNodeName())) 
      { 
                        // 如果节点的名称为"Account"，则输出Account元素属性type
      System.out.println("\r\n找到一篇账号. 所属区域: "   + node1.getAttributes().getNamedItem        ("type").getNodeValue() + ". ");
      NodeList nodeDetail = node1.getChildNodes();   // 获得<Accounts>下的节点
      for (int j = 0; j < nodeDetail.getLength(); j++)
       {   // 遍历<Accounts>下的节点
          Node detail = nodeDetail.item(j);    // 获得<Accounts>元素每一个节点
            if ("code".equals(detail.getNodeName()))   // 输出code
            System.out.println("卡号: " + detail.getTextContent());
             else if ("pass".equals(detail.getNodeName())) // 输出pass
                System.out.println("密码: " + detail.getTextContent());
             else if ("name".equals(detail.getNodeName())) // 输出name
                System.out.println("姓名: " + detail.getTextContent());
             else if ("money".equals(detail.getNodeName())) // 输出money
                 System.out.println("余额: "+ detail.getTextContent());
      
        }
      }

    }
}

catch(Exception e){System.out.println(e);}
    
}

XML code

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<?xml version="1.0" encoding="gbk"?>      
<Accounts>
<Account type="by0003"> 
<code>100001</code>
<pass>123</pass>
<name>李四</name> 
<money>1000000.00</money> 
</Account> 
<Account type="hz0001"> 
<code>100002</code>
<pass>123</pass>
<name>张三</name> 
<money>1000.00</money> 
</Account> 
</Accounts>

java jdbc数据库连接

Java code

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import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;


public class JDBConnection {
    public Connection conn = null; // 声明Connection对象的实例
    public Statement stmt = null; // 声明Statement对象的实例
    public ResultSet rs = null; // 声明ResultSet对象的实例
    
    private static String dbClassName = "com.microsoft.jdbc.sqlserver.SQLServerDriver";//定义保存数据库驱动的变量
    private static String dbUrl = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=DB_ATM";
    private static String dbUser = "sa";
    private static String dbPwd = "sa";

    public JDBConnection(String propertyFileName) {// 带属性文件名的构造方法
        Properties prop = new Properties();// 属性集合对象
        InputStream is = null;
        try {
            is = JDBConnection.class.getClassLoader().getResourceAsStream(
                    propertyFileName);// 属性文件输入流
            // is = new FileInputStream("src/" + propertyFileName);
            prop.load(is);// 将属性文件流装载到Properties对象中
            is.close();// 关闭流
            dbClassName = prop.getProperty("dbClassName");
            dbUrl = prop.getProperty("dbUrl");
            dbUser = prop.getProperty("dbUser");
            dbPwd = prop.getProperty("dbPwd");
        } catch (Exception e) {
            System.out.println("属性文件  " + propertyFileName + " 打开失败！");
        }
        try {

            Class.forName(dbClassName);// 1.注册驱动
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    public JDBConnection() {// 默认的不带参数的构造函数
        try {

            Class.forName(dbClassName);// 1.注册驱动
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    public static Connection getConnection() {
        Connection conn = null;
        try {
            // Class.forName(dbClassName);// 1.注册驱动
            conn = DriverManager.getConnection(dbUrl, dbUser, dbPwd);//2.建立与数据库的链接
        } catch (Exception ee) {
            ee.printStackTrace();
        }
        if (conn == null) {
            System.err
                    .println("警告: DbConnectionManager.getConnection() 获得数据库链接失败.\r\n\r\n链接类型:"
                            + dbClassName
                            + "\r\n链接位置:"
                            + dbUrl
                            + "\r\n用户/密码"
                            + dbUser + "/" + dbPwd);
        }
        return conn;
    }

    /*
     * 功能：执行查询语句
     */
    public ResultSet executeQuery(String sql) {
        try { // 捕捉异常
            conn = getConnection(); // 调用getConnection()方法构造Connection对象的一个实例conn
            stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,//3.创建语句
                    ResultSet.CONCUR_READ_ONLY);
            rs = stmt.executeQuery(sql);//4.执行查询
        } catch (SQLException ex) {
            System.err.println(ex.getMessage()); // 输出异常信息
        }
        return rs; // 返回结果集对象 5.结果处理
    }

    /*
     * 功能:执行更新操作
     */
    public int executeUpdate(String sql) {
        int result = 0; // 定义保存返回值的变量
        try { // 捕捉异常
            conn = getConnection(); // 调用getConnection()方法构造Connection对象的一个实例conn
            stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
                    ResultSet.CONCUR_READ_ONLY);
            result = stmt.executeUpdate(sql); // 执行更新操作
        } catch (SQLException ex) {
            result = 0; // 将保存返回值的变量赋值为0
        }
        return result; // 返回保存返回值的变量
    }

    /*
     * 功能:关闭数据库的连接
     */
    public void close() {//6.释放资源
        try { // 捕捉异常
            try {
                if (rs != null) { // 当ResultSet对象的实例rs不为空时
                    rs.close(); // 关闭ResultSet对象
                }
            } finally {
                try {
                    if (stmt != null) { // 当Statement对象的实例stmt不为空时
                        stmt.close(); // 关闭Statement对象
                    }
                } finally {
                    if (conn != null) { // 当Connection对象的实例conn不为空时
                        conn.close(); // 关闭Connection对象
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace(System.err); // 输出异常信息
        }
    }

}

属性文件
dbClassName=com.microsoft.jdbc.sqlserver.SQLServerDriver
dbClassName2=com.mysql.jdbc.Driver
dbPwd=sa
dbPwd2=root
dbUrl=jdbc\:microsoft\:sqlserver\://localhost\:1433;DatabaseName\=DB_ATM
dbUrl2=jdbc\:mysql\://localhost\:3306/db_atm
dbUser=sa
dbUser2=root
java自定义按钮外观

Java code

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import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.UIManager;
import javax.swing.plaf.synth.SynthLookAndFeel;
 
public class MyButton {
 JFrame frame = new JFrame("Test Buttons");
 JButton jButton = new JButton("JButton"); // 按钮
 public MyButton() {
  frame.setLayout(new FlowLayout());
  frame.getContentPane().add(jButton);
 }
 public void show() {
  frame.pack();
  frame.show();
 }
 public static void main(String[] args) {
  MyButton tb = new MyButton();
  tb.show();
  SynthLookAndFeel slf = new SynthLookAndFeel();
  try {
      slf.load(MyButton.class.getResourceAsStream("mybutton.xml"), MyButton.class);
      UIManager.setLookAndFeel(slf);
  } catch (Exception e) {
      e.printStackTrace();
      return;
  }

 }
}

XML code

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<synth>
  <style id="mybutton">
     <state>
       <imagePainter method="buttonBackground" path="mybutton.png" sourceInsets="3 6 12 20" paintCenter="true" stretch="true"/>
    <insets top="3" left="6" bottom="12" right="20"/>
    <font name="Aharoni" size="16"/>
  </state>
  <property key="Button.margin" type="insets" value="0 0 5 8"/>
  </style>
  <bind style="mybutton" type="region" key="Button"/>
</synth>

java访问资源文件

Java code

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import java.io.FileInputStream;   
import java.io.FileOutputStream;   
import java.util.Properties;   
  
public class PropertyEditor {   
    public static void main(String[] args) throws Exception {   
        Properties prop = new Properties();// 属性集合对象   
        FileInputStream fis = new FileInputStream("prop.properties");// 属性文件输入流   (相对于根目录下的文件名，要加上包名 “src/prop.properties”)
        prop.load(fis);// 将属性文件流装载到Properties对象中   
        fis.close();// 关闭流   
  
        // 获取属性值，sitename已在文件中定义   
        System.out.println("获取属性值：sitename=" + prop.getProperty("sitename"));   
        // 获取属性值，country未在文件中定义，将在此程序中返回一个默认值，但并不修改属性文件   
        System.out.println("获取属性值：country=" + prop.getProperty("country", "中国"));   
  
        // 修改sitename的属性值   
        prop.setProperty("sitename", "中国");   
        // 添加一个新的属性studio   
        prop.setProperty("studio", "Boxcode Studio");   
        // 文件输出流   
        FileOutputStream fos = new FileOutputStream("prop.properties");   
        // 将Properties集合保存到流中   
        prop.store(fos, "Copyright (c) Boxcode Studio");   
        fos.close();// 关闭流   
    }   
}  

资源文件

sitename=\u4E2D\u56FD
siteurl=www.abcjava.com  
studio=Boxcode Studiojava日期处理bean

Java code

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import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.regex.Pattern;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


public class DateUtil {
    protected static Log logger = LogFactory.getLog(DateUtil.class);

    // 格式：年－月－日 小时：分钟：秒
    public static final String FORMAT_ONE = "yyyy-MM-dd HH:mm:ss";

    // 格式：年－月－日 小时：分钟
    public static final String FORMAT_TWO = "yyyy-MM-dd HH:mm";

    // 格式：年月日 小时分钟秒
    public static final String FORMAT_THREE = "yyyyMMdd-HHmmss";

    // 格式：年－月－日
    public static final String LONG_DATE_FORMAT = "yyyy-MM-dd";

    // 格式：月－日
    public static final String SHORT_DATE_FORMAT = "MM-dd";

    // 格式：小时：分钟：秒
    public static final String LONG_TIME_FORMAT = "HH:mm:ss";

    //格式：年-月
    public static final String MONTG_DATE_FORMAT = "yyyy-MM";

    // 年的加减
    public static final int SUB_YEAR = Calendar.YEAR;

    // 月加减
    public static final int SUB_MONTH = Calendar.MONTH;

    // 天的加减
    public static final int SUB_DAY = Calendar.DATE;

    // 小时的加减
    public static final int SUB_HOUR = Calendar.HOUR;

    // 分钟的加减
    public static final int SUB_MINUTE = Calendar.MINUTE;

    // 秒的加减
    public static final int SUB_SECOND = Calendar.SECOND;

    static final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四",
            "星期五", "星期六" };

    @SuppressWarnings("unused")
    private static final SimpleDateFormat timeFormat = new SimpleDateFormat(
            "yyyy-MM-dd HH:mm:ss");

    public DateUtil() {
    }

    /**
     * 把符合日期格式的字符串转换为日期类型
     */
    public static java.util.Date stringtoDate(String dateStr, String format) {
        Date d = null;
        SimpleDateFormat formater = new SimpleDateFormat(format);
        try {
            formater.setLenient(false);
            d = formater.parse(dateStr);
        } catch (Exception e) {
            // log.error(e);
            d = null;
        }
        return d;
    }

    /**
     * 把符合日期格式的字符串转换为日期类型
     <

  


  

    
    
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2011-04-07 10:09
      
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